Note 9 - Senior Notes, Credit Facilities and Capital Leases (Details) - Credit Facilities	3 Months Ended
	Mar. 31, 2014
Interest rates:
Standby fee per annum on undrawn amounts	0.50%
Minimum [Member] | Senior Leverage Ratio [Member] | Previous Facility [Member]
Covenant financial ratios:
Covenant	not more than 2.50:1
Minimum [Member] | Leverage Ratio [Member] | Previous Facility [Member]
Covenant financial ratios:
Covenant	not more than 4.00:1
Minimum [Member] | Interest Coverage Ratio [Member] | Previous Facility [Member]
Covenant financial ratios:
Covenant	not less than 3.00:1
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Previous Facility [Member]
Interest rates:
Interest rates	3.00%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Current Facility [Member]
Interest rates:
Interest rates	2.25%
Minimum [Member] | Base Rate [Member] | Previous Facility [Member]
Interest rates:
Interest rates	2.00%
Minimum [Member] | Base Rate [Member] | Current Facility [Member]
Interest rates:
Interest rates	1.25%
Minimum [Member] | Previous Facility [Member]
Interest rates:
Standby fee per annum on undrawn amounts	0.825%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Previous Facility [Member]
Interest rates:
Interest rates	4.50%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Current Facility [Member]
Interest rates:
Interest rates	3.25%
Maximum [Member] | Base Rate [Member] | Previous Facility [Member]
Interest rates:
Interest rates	3.50%
Maximum [Member] | Base Rate [Member] | Current Facility [Member]
Interest rates:
Interest rates	2.25%
Maximum [Member] | Previous Facility [Member]
Interest rates:
Standby fee per annum on undrawn amounts	1.05%